Effect of crack closure on quantitative ECT inspection of closed fatigue cracks

Zhenmao Chen, Noritaka Yusa, Kenzo Miya, Hideaki Tokuma

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)


In this paper, the feasibility to apply a closed fatigue crack as a substitute of a Stress Corrosion Crack (SCC) is investigated aiming at applications to ECT crack sizing. Several testpieces of closed fatigue cracks are fabricated, and ECT signals are measured after selected bending loads being applied to close the crack. From the measured signals, the crack profiles are reconstructed by using a deterministic inversion technique, and the sizing results are compared with the true crack profiles in order to evaluate the effect of crack closure. The results reveal that the closing load does not give significant influence on the crack sizing precision. Therefore, to simulate SCC with a fatigue crack closed by 3 point bending testing is not a suitable way from the view point of ECT inversion.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (XI)
EditorsAntonello Tamburrino, Yevgen Melikhov, Zhenmao Chen, Lalita Udpa
Number of pages8
Publication statusPublished - 2008

Publication series

NameStudies in Applied Electromagnetics and Mechanics
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322


  • Crack Closure
  • Crack sizing
  • Eddy Current Testing
  • Fatigue crack


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